package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {


    @Resource
    private StringRedisTemplate stringRedisTemplate;

    private static final int COUNT_BITS =32;

    private static final Long BEGIN_TIMESTAMP = 1714003200L;


    public Long nextId(String keyPrefix){
        //1 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        // 2.生成序列号
        // 2.1.获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.2.自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        // 3.拼接并返回
        return timestamp << COUNT_BITS | count;
    }

/*    public static void main(String[] args) {
        LocalDateTime of = LocalDateTime.of(2024, 4, 25, 0, 0, 0);
        long second = of.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);


    }*/






}
